On a cold winter night you switch on a r...

On a cold winter night you switch on a room heater to keep your room warm. Does it mean that the total energy of the air inside the room increases after you switch on the heater?

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When current is switched 'on' in a room heater, it __________.

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Air is contained in a vertical piston – cylinder assembly fitted with an electric heater. The piston has a mass of 50 kg and cross sectional area of 0.1 m^(2) . Mass of the air inside the cylinder is 0.3 kg. The heater is switched on and the volume of the air slowly increases by 0.045 m^(3) . It was found that the internal energy of the air increased by 32.2 kJ//kg and that of the piston increased by 0.06 kJ/kg. Assume that the container walls and outer surface of the piston are well insulated and there is no friction. The atmospheric pressure is 100 kPa. Determine the heat transferred by the heater to the system consisting of air and the piston.

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On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of :

An electric current of 8 A is made to flow through a room heater of resistance 30 omega . Calculate (1) the potential difference across the heater. (2) the power supplied to the heater. (3) the amount of heat energy liberated from it in one minute. (4) If the heater is used for 10 hours daily in the months of December, then find the num ber of units of electrical energy consumed by it.

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ARIHANT-KINETIC THEORY OF GASES-Level 2

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